Air suspension push in fittings issues

[biohazardbill]

So doing an air test on my truck i set all 4 airbags to max height and let it sit over night.

Rear bags both dropped about 3 lbs, front left dropped 5 lbs and right front dropped 30.

I figured the the that had small drops in pressure was possibly due to temp change during the night.

So I disassembled the pass side and re sealed the fittings, reassembled, retested all was well.

So I had to reroute my lines for other reasons.

Rerouted pass side and drivers side front. Tested. drivers side now drops in pressure over night. Took apart resealed, retested, pass side now dropping over night and I didnt even touch that side since the previous test.

Rear has had no issues however really dont have any weight on it either.

Ideas?

Swap out fittings for compression fittings?

[Pro Performance]

A good way to track down leaks is with soapy water. What are you using for thread sealant? A good one to use is Loctite 545. It might be leaking through your threads and not the PTC itself.

When using PTC fittings, just make sure to cut the line very square at the end, and fully insert until it bottoms out. Then give it a light tug to ensure it is seated and the PTC fittings it grabbing it.

The soapy water will help track down that leak though.

- Travis

[biohazardbill]

Problem is I cannot actually visually see those fittings in the crossmember and it is such a slow leak i dont forsee it making bubbles right away.

The sealant I use is

ARP Thread Sealant

All cuts are made with the air line cutter I got from Ride Tech.

I have pushed the line in several times to make sure that it has been fully inserted.

Driving me nuts lol

[Pro Performance]

Sometimes tracing down these leaks can be frustrating. Best thing to do is pull the brackets so you can spray them down with soapy water. If it isn't the threads of the PTC fittings, then check the bag itself by spraying it down. Bags don't leak that often, but it is possible.

What valves are you using? Some require some sort of tank pressure to completely close off. Is it leaking at the valve end?

[jimmydean]

I used soapy water last time with great results. My issue was the opposite, mine would inflate one rear bag while sitting. It took a while to track it all down, but I did. Best of luck, I know how frustrating it can be.

[PBFAB.COM]

One thing that we have found, is that once you put a virgin line into a PTC fitting it will put a little barb/scratch on the line. If you remove the line and reinsert it into the PTC without trimming off the end section of the line so it is fresh and smooth, it will usually cause a small leak.

Make sure if you remove the line, you trim off about 1/4" of the line before you reinsert it.

Nate

[biohazardbill]

Originally Posted by Porterbuilt Street Rods

One thing that we have found, is that once you put a virgin line into a PTC fitting it will put a little barb/scratch on the line. If you remove the line and reinsert it into the PTC without trimming off the end section of the line so it is fresh and smooth, it will usually cause a small leak.

Make sure if you remove the line, you trim off about 1/4" of the line before you reinsert it.

Nate

This makes sense and why one side started leaking after rerouting the line.

I will try this on the front once I get the rear end back together... (doing an axle shaft swap at the moment to get the 5 lug pattern)

Will let you guys know what happens

[biohazardbill]

Ok

So I was waiting til I installed the levelling sensors before tackling this issue.

Line completely disconnected, trimmed about a half inch off both ends. Passenger side still has a slow leak. Lost 10-12 lbs overnight.

Would it hurt the bag if I removed it completely and put 100lbs of pressure or so in it with no resistance so I can check the fitting?

[northeimcustom]

Originally Posted by biohazardbill

Ok

So I was waiting til I installed the levelling sensors before tackling this issue.

Line completely disconnected, trimmed about a half inch off both ends. Passenger side still has a slow leak. Lost 10-12 lbs overnight.

Would it hurt the bag if I removed it completely and put 100lbs of pressure or so in it with no resistance so I can check the fitting?

i wouldnt think so, as long as the bag doesnt go past its height limit.

[smoknbarrels]

not sure what brand bags they use? but I inflate my slams with no load to 150psi all the time. doesn't hurt them. as long as you dont go over the rated pressure (200psi in my case), height limit means nothing.

[biohazardbill]

I have the SS 8 bags.

Another question while we are on the subject. Since I lost about 12 lbs of pressure last night, that is about 1 lb per hour... super slow leak. Any ideas on how to check where the leak is other than the obvious soapy water and watch it?

[jimmydean]

Soapy water is about all you can do unless you can submerge the whole system in water and look for bubbles like you do when patching a tire.

[biohazardbill]

I do have a lake out back, might just drive the whole truck into it lol

[Square_78]

Hahahahaha!
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